<template>
	<view>
		<view class="scroll-view-container">
			<!-- 左侧的滑动区域 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height:wh+'px'}">
				<block  v-for="(item,index) in cateList" :key="item.cat_id">
					<view :class="['left-scroll-view-item',index===active?'active':'']" @click="activeChange(index)">
						{{item.cat_name}}
					</view>
				</block>
			</scroll-view>
			<!-- 右侧的滑动区域 -->
			<scroll-view scroll-y="true" :style="{height:wh+'px'}">
				<view class="cate-lv2" v-for="(im,i) in cateLevel2" :key="im.cat_id">
					<!-- 二级标题 -->
					<view class="cate-lv2-title">/ {{im.cat_name}} /</view>
					<!-- 动态渲染三级分类列表 -->
					<view class="cate-lv3-list">
						<!-- 三级分类 item 项 -->
						<view class="cate-lv3-item" v-for="(im2,i2) in im.children" :key="im2.cat_id" @click="gotoGoodsList(im2)">
							<!-- 图片 -->
							<image :src="im2.cat_icon"></image>
							<!-- 文本 -->
							<text>{{im2.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				// 当前设备可用的高度
				wh:0,
				// 分类数据列表
				cateList:[],
				active:0,
				// 二级分类
				cateLevel2:[]
			};
		},
		onLoad(){
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight
			// 请求分类数据
			this.getCateList()
		},
		methods:{
			// 获取分类列表数据
			async getCateList(){
				const {data:res} = await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status !== 200) return uni.showMag()
				// 一级分类
				this.cateList = res.message
				console.log(this.cateList)
				// 二级分类
				this.cateLevel2 = this.cateList[0].children
			},
			// 点击激活项
			activeChange(i){
				this.active = i
				// 重新为2及分类赋值
				this.cateLevel2 = this.cateList[i].children
			},
			
			// 三级分类点击跳转详情页
			gotoGoodsList(item){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid='+item.cat_id
				})
			}
		}
	}
</script>

<style lang="scss">
.scroll-view-container{
	display: flex;
	background-color: #fff;
	
	.left-scroll-view{
		width: 120px;
		
		.left-scroll-view-item{
			background: #F7F7F7;
			line-height: 60px;
			text-align: center;
			font-size: 12px;
			
			&.active{
				background: #FFF;
				position: relative;
				
				&::before{
					content: ' ';
					display: block;
					width:3px;
					height:30px;
					background: #c00000;
					position: absolute;
					top:50%;
					left:0px;
					transform: translateY(-50%);
				}
			}
		}
	}
}

.cate-lv2-title{
	font-size: 12px;
	font-weight: bold;
	text-align: center;
	padding: 15px 0;
}

.cate-lv3-list{
	display: flex;
	flex-wrap: wrap;
	.cate-lv3-item{
		width: 33.33%;
		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;
		margin-bottom: 10px;
		
		image{
			width: 60px;
			height:60px
		}
		
		text{
			font-size: 12px;
		}
	}
}
</style>
